Blow-off valve.



BLOW

Tl N

. FOSTER.

-0FF VALVE.

FILED MAR-1.0. l9l5 Patented Apr. 8,1919. I

UNITED STATES PATENT OFFICE.

RALPH W. FOSTER, OI BOSTON, MASSACHUSETTS, ASSIGNOR TO CROSBY STEAM GAGE & VALVE COMPANY, OF BOSTON, MASSACHUSETTS/A CORPORATION.

BLOW-OFF VALVE.

Application filed March 10, 1915. Serial No. 13,470.

To all whom it may concern:

Be it known that I, RALPH- WQFosrnn, a

citizen of the United States, and a resident of Boston,.in .the county of Sufiolk and 4 secure easy action, while reducing to a minimum the friction of the parts and the deterioration caused thereby.

, It is illustrated by the accompanying drawings in which:

Figure 1 is a sectional view on-the line 1-1 Fig. 2; and F Fig. 2 is a'sectional view onthe line 2-2 The valve casing comprises two members 1 and 2 fastened together by bolts 3 and furnished respectively with the induction portfl and the eduction port 5; the member 2 b'elng furnished also with the valve seat 6 extended as shown. The valve 7 is cupshaped and fits loo'sely in the stirrup 8, similarly shaped'but having a perforated bottom said stirrup havlng an arm 10 rigidly aifix'e'dito' or integral with the s indle 11 and furnished with the wings 12 ad; to engage the wall of member 2 and thereby limit theswing of the arm. The spindle 11 is oscillatingly mounted in the member 2,

Specification of Letters Patent.

within the casing pted Patented "Apr. 8, 1919.

being centrally flanged to engage the inner Wall of said member, while'to its outer end is removablyattached thelever 13, whereby it may be oscillated; the inner end of said spindle being recessed to receive the spring 14 disposed therein between the spindle and member 1 of the casing and adapted to restrain longitudinal movement of the spin dle. The spring 15 is disposed in the valve- 7 between it and the stirrup 8 and serves as an independent means, additional or su plementary to the fluid pressure, to hold t e valve to its seat. 1

I claim: 1

A valve of the character described comprising, in combination, a casing having induction and eduction ports; a valve seat I and adjacent the eduction port; an oscillatory stirrup disposed 1n the casing and spaced from the adjacent walls thereof and furnished with wings osci latory movement; a valve for said seat loosely disposed in the stirrup; a spindle mounted in e casing and rigidly aflixed to the stirrup; and means for oscillatin the spindle and thereby the stirrup an valve disposed therein. 1

the

adapted to engage the casing and limit such In ztestunony whereof I have aflixed my signature, in presence of two witnesses.

RALPH W. FOSTER. Witnesses:

' ETHEL W. FAxoN,

Omnnncn L. NEWTON." 

